CVE-2026-64227

Kernel crash via missing ACPI companion check

Published Jul 24, 2026 · Updated Jul 24, 2026

NULL pointer dereference in Linux Kernel ACPI platform drivers in affected releases allows local users to crash the kernel. The probe paths in 13 core ACPI drivers assume ACPI_COMPANION() or ACPI_HANDLE() is non-NULL and dereference a missing companion after an override forces an unrelated match. The path requires local low-privileged access and a forced driver/device mismatch; the bounded impact is a kernel crash, with no published data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel ACPI platform drivers in affected releases allows local users to crash the kernel. The probe paths in 13 core ACPI drivers assume ACPI_COMPANION() or ACPI_HANDLE() is non-NULL and dereference a missing companion after an override forces an unrelated match. The path requires local low-privileged access and a forced driver/device mismatch; the bounded impact is a kernel crash, with no published data exposure or modification.

The record

CVE
CVE-2026-64227
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.12.97
  2. Affected versionversion=0 <6.18.40
  3. Affected versionversion=0 <6.6.145
  4. Affected versionversion=0 <7.0.11
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34f4d0e4e5065237d15651df759a99e81b7f9f51
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <612ddab8fce04394bd7aebe8e0f2599642e30859
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9451bf561232314755baf69a5916e0ac77f33fc
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4865a56d013e86e46ea6acea15bb6eae01898ff
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1e12d81f9cd250e722da01c7670b518d4181406

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <6.12.97; version=0 <6.18.40; version=0 <6.6.145; version=0 <7.0.11; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <34f4d0e4e5065237d15651df759a99e81b7f9f51; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <612ddab8fce04394bd7aebe8e0f2599642e30859; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a9451bf561232314755baf69a5916e0ac77f33fc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e4865a56d013e86e46ea6acea15bb6eae01898ff; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1e12d81f9cd250e722da01c7670b518d4181406

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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